FE Modeling And Implementation Of Needle Insertion Into Soft Tissue

Needle Insertion has the advantages of minimally invasive, safety and fast recovery, so it is widely used in surgery, such as biopsy,topical anesthesia and tumor ablation. The accuracy and success rate of the needle insertion is important influence by the surgeon’s experience. However, the training at home can’t satisfy the requirement of training the new doctors, in which trainee insert totally different material. Therefore, it is significant to design a visual surgery system of needle insertion.Considering the known characters of insertion process, we build a novel needle-tissue cou-pling model by theoretical analysis and experimental study. We build a unify force model based on the experiment data, which includes defining the force components and analyzing the coupling mode. At last, we testify the rationality of the finite element model and propose the general param-eters calibration method for piercing different materials.In this article, the ideas in method of "replacement" and "remesh" are used in local constraint method. This new method avoids the sudden changing in the computational process and satisfies the real-time requirement of the algorithm. In detail, we get the solutions of the function under different constraints.In the side of unify force model, we design contrast experiments of biological tissue and artificial tissue to certify the rational of the model assumption and analyze the character of the force. At last, the unify force model is builded with consider of the force components and theirs characters.In the aspect of parameter calibration, the appropriate parameters are selected by their physical significance and effective in the simulation. And then, multiple linear regression model is used to analyze parametric sensitivity, and it also transform the parameter calibration to a optimization procedure. Combining the optimal solution and parametric sensitivity is a general way to calibrate the model.